21 Hungarian Dances, WoO 1: No. 4 in F Minor: Poco sostenuto (Arr. for Piano Duet)

Recording identifiers

ISRC

NLA508127004

Release date of the album this recording appears on

1981-08-01

CopyrightID (CopyrightChains transaction hash)

0x9af3fa429d339ee1184a36b6a7aab5e8cd2de3b64a5bfd8fe60bc646edeadfa0

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-08-01T03:13:03Z

Bitcoin block

960500

Canonical record hash

sha256:d77970671565375e8b6309c00990ddbaf9c74b1d5e71fdb803e346554821b254

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC NLA508127004

What this proof establishes

This recording was released in 1981, before generative AI. ProofProfile's catalogue derives from the pre-2022 AcousticBrainz and MusicBrainz source corpus, and ISRC is the stable recording-level bridge from that source corpus to the authoritative cc-db-prod track record.

CopyrightChains and Bitcoin OpenTimestamps make the exact committed record independently verifiable today. The cryptographic proof does not by itself establish authorship or ownership of the underlying recording.

Read the complete pre-generative-AI provenance and verification method.